Note 1. I rather doubt that having been on the forums for over 6 years now, see note 3.
Note 2. First a bug has to be identified and frequently what is being reported isn't a bug, you only have to browse the forums to see lots of people reporting bugs, which in fact aren't bugs at all. Often it is conflict with other applications, etc.
Note 3. You haven't been here, despite numerous different forums for the different avast products, people post all over the place and I somehow doubt that would change.
Note 4. Users that use the search function that already exists in the forums are very few and far between by the number of frequently posted common questions, many don't even notice there is a search function at the top of every page...
So somehow having another forum I don't believe will change that.